examples

commit 97bf4e4f5c2f09ee6f2e843aed1b27aed306bcb0
parent 665a10412fc08fdc81263695f3bb86fda96eb88e
Author: Henry Wilson <henry@henryandlizzy.uk>
Date:   Sun,  3 Apr 2022 14:09:15 +0100

gl-asteroids: Tidy up a bit and add collision debris

Diffstat:
M
src/gl-asteroids.cpp
 | 
29
+++++++++++++++++++++++------

1 file changed, 23 insertions(+), 6 deletions(-)
diff --git a/src/gl-asteroids.cpp b/src/gl-asteroids.cpp
@@ -46,10 +46,10 @@ coord const rockv2[] = {{0, 0}, {1, 0}, {.7,.7}, {0, 1}, {-1, 0}, {-.9,-.9}, {0,
 coord const rockv3[] = {{0, 0}, {1, 0}, {.7,.4}, {0, 1}, {-.8,.6}, {-1, 0}, {-.6,-.5}, {0, -1}, {1, 0}};
 coord const rockv4[] = {{0, 0}, {1, 0}, {.6,.4}, {0, .5}, {-.3,.6}, {-1, 0}, {-.6,-.5}, {0, -1}, {1, 0}};
 
-color const rockc[] = {{.5,.5,.5}, {.3,.3,.3}};
+color const rockc[] = {{.5,.5,.5}, {.2,.2,.2}};
 
 coord const bulletv[] = {{0, 4}, {1, 1}, {-1, 1}, {1, -4}, {-1, -4}};
-color const bulletc[] = {{.0,.8,.0}, {.0,.6,.0}, {.0,.6,.0}, {.0,.4,.0}};
+color const bulletc[] = {{.0,.8,.0}, {.0,.4,.0}, {.0,.4,.0}, {.0,.0,.0}};
 
 visual ship{GL_TRIANGLES, shipv, shipc};
 visual flame{GL_TRIANGLES, flamev, flamec};
@@ -252,6 +252,8 @@ int main(int argc, char* argv[])
 			if (dir & 2)
 				v.y = -v.y;
 
+			v *= log(t+1);
+
 			coord p = {dis_p(gen), 1};
 			if (dir & 3)
 				std::swap(p.x, p.y);
@@ -261,7 +263,7 @@ int main(int argc, char* argv[])
 
 		if (is_pressed(GLFW_KEY_SPACE) && bullet_time < t)
 		{
-			bullet_time = t + .5f;
+			bullet_time = t + .3f;
 
 			bullets.emplace_back(bullet, s);
 			auto& b = bullets.back().p;
@@ -281,7 +283,6 @@ int main(int argc, char* argv[])
 		else
 			s.ang_mom = 0;
 
-
 		bool up = is_pressed(GLFW_KEY_UP);
 		if (up)
 		{
@@ -294,8 +295,8 @@ int main(int argc, char* argv[])
 			f.vel += coord{cr, -sr} * 0.2 * dis_p(gen);
 			particle::make_particle(entity(flame, f), 1);
 		}
-		glClearColor(0,0,0,1);
-		glClear(GL_COLOR_BUFFER_BIT);
+
+		// resolve motion
 
 		for (auto& r : rocks)
 			r.p.move(dt);
@@ -304,6 +305,8 @@ int main(int argc, char* argv[])
 		s.move(dt);
 		particle::move_all(dt);
 
+		// handle collisions
+
 		if(any_of(rocks.begin(), rocks.end(), [&s](auto& r) { return is_colliding(s, r.p); }))
 			glfwSetWindowShouldClose(w, 1);
 
@@ -314,6 +317,15 @@ int main(int argc, char* argv[])
 			{
 				if (is_colliding(r->p, b->p))
 				{
+					for (unsigned j = 0; j < 7; ++j)
+					{
+						entity debris = *r;
+						debris.p.vel.x += .3 * dis_p(gen);
+						debris.p.vel.y += .3 * dis_p(gen);
+						debris.p.scale /= 5;
+						particle::make_particle(debris, .7);
+					}
+
 					if (r->p.scale > .1f)
 					{
 						r->p.vel *= 1.5f;
@@ -336,6 +348,11 @@ int main(int argc, char* argv[])
 		bang:	continue;
 		}
 
+		// Draw scene
+
+		glClearColor(0,0,0,1);
+		glClear(GL_COLOR_BUFFER_BIT);
+
 		particle::draw_all();
 		for (auto& r : rocks)
 			r.draw();